German tuning house, Racing Dynamics GmbH, now offers a more muscular BMW M5. A thorough upgrade of the 5.0 litre 32 valve V8 engine creates a 375 kW monster of a sports sedan with torque to burn. For Racing Dynamics claims a torque figure of 608 Nm at 4,000 rpm for the upgraded engine, the extra grunt won through the fitting of a ram air induction system, lighter forged pistons, lighter rods, and a freer flowing exhaust system. New engine management software and a higher compression ratio also help the modified M5 achieve supercar levels of performance. Racing Dynamics claims a top speed of 310 km/h for its new charger, and a 0-100 time of just 4.8 seconds. The engine upgrade isn't cheap, costing close to $100,000.